linux-kernel - Re: [PATCH 1/2] iio: dac: stm32-dac: use reset controller only at probe time

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Message-ID: <20200118143046.4e6a6b95@archlinux>
Date:   Sat, 18 Jan 2020 14:30:46 +0000
From:   Jonathan Cameron <jic23@...nel.org>
To:     Fabrice Gasnier <fabrice.gasnier@...com>
Cc:     <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <mcoquelin.stm32@...il.com>,
        <alexandre.torgue@...com>, <olivier.moysan@...com>,
        <linux-iio@...r.kernel.org>, <lars@...afoo.de>, <knaack.h@....de>,
        <pmeerw@...erw.net>, <linux-stm32@...md-mailman.stormreply.com>,
        <etienne.carriere@...com>
Subject: Re: [PATCH 1/2] iio: dac: stm32-dac: use reset controller only at
 probe time

On Mon, 13 Jan 2020 14:14:25 +0100
Fabrice Gasnier <fabrice.gasnier@...com> wrote:

> From: Etienne Carriere <etienne.carriere@...com>
> 
> This change removes the reset controller reference from the local
> DAC instance since it is used only at probe time.
> 
> Signed-off-by: Etienne Carriere <etienne.carriere@...com>
> Signed-off-by: Fabrice Gasnier <fabrice.gasnier@...com>
Makes sense.

Applied to the togreg branch of iio.git and pushed out as testing
to let those autobuilders poke at it for a few hours.

Thanks,

Jonathan

> ---
>  drivers/iio/dac/stm32-dac-core.c | 11 +++++------
>  1 file changed, 5 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/iio/dac/stm32-dac-core.c b/drivers/iio/dac/stm32-dac-core.c
> index 9e6b4cd..4d93446 100644
> --- a/drivers/iio/dac/stm32-dac-core.c
> +++ b/drivers/iio/dac/stm32-dac-core.c
> @@ -20,13 +20,11 @@
>  /**
>   * struct stm32_dac_priv - stm32 DAC core private data
>   * @pclk:		peripheral clock common for all DACs
> - * @rst:		peripheral reset control
>   * @vref:		regulator reference
>   * @common:		Common data for all DAC instances
>   */
>  struct stm32_dac_priv {
>  	struct clk *pclk;
> -	struct reset_control *rst;
>  	struct regulator *vref;
>  	struct stm32_dac_common common;
>  };
> @@ -94,6 +92,7 @@ static int stm32_dac_probe(struct platform_device *pdev)
>  	struct regmap *regmap;
>  	struct resource *res;
>  	void __iomem *mmio;
> +	struct reset_control *rst;
>  	int ret;
>  
>  	if (!dev->of_node)
> @@ -148,11 +147,11 @@ static int stm32_dac_probe(struct platform_device *pdev)
>  	priv->common.vref_mv = ret / 1000;
>  	dev_dbg(dev, "vref+=%dmV\n", priv->common.vref_mv);
>  
> -	priv->rst = devm_reset_control_get_exclusive(dev, NULL);
> -	if (!IS_ERR(priv->rst)) {
> -		reset_control_assert(priv->rst);
> +	rst = devm_reset_control_get_exclusive(dev, NULL);
> +	if (!IS_ERR(rst)) {
> +		reset_control_assert(rst);
>  		udelay(2);
> -		reset_control_deassert(priv->rst);
> +		reset_control_deassert(rst);
>  	}
>  
>  	if (cfg && cfg->has_hfsel) {